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Components of Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Deposits By Type [Line Items]    
Noninterest-bearing demand deposits $ 353,137 $ 339,680
Interest-bearing deposits:    
Interest-bearing demand deposits 382,752 361,821
Money market accounts 236,914 237,845
Savings deposits 294,183 286,165
Certificates of deposit 589,469 606,178
Individual retirement accounts 118,234 119,053
Total interest-bearing deposits 1,621,552 1,611,062
Total deposits $ 1,974,689 $ 1,950,742